An Optimal Calculation Method and Device for Arc Extinction Angle Measured in Inverter Station

Abstract

The present application discloses an optimal calculation method and device for an arc extinguishing angle actually measured by an inverter station. The method includes obtaining the arc extinguishing angle and AC voltage of the current cycle and the previous cycle; calculating the arc extinguishing angle deviation value and the AC voltage deviation value; Judging whether the arc extinguishing angle of the current cycle is valid; if valid, judging whether the arc extinguishing angle of the current cycle is greater than the minimum arc extinguishing angle test value of the converter valve when it leaves the factory; if so, output the arc extinguishing angle of the current cycle to the extreme control system; If not, judge whether the holding time is less than or equal to the commutation period; if yes, output the arc extinguishing angle of the previous cycle to the extreme control system; if not, output the arc extinguishing angle of the current cycle to the extreme control system. In this application, when the measured arc extinguishing angle is abnormal, the system can avoid the abnormal and stable operation of the high-voltage DC system caused by the wrong arc extinguishing angle for control, and can also avoid the measured arc extinguishing of a certain commutation bridge in the case of AC system oscillation. When the corner is abnormal, it will impact the DC system.

Description

technical field [0001] The present application relates to the technical field of high-voltage direct current transmission, and in particular to an optimal calculation method and device for arc extinction angle actually measured in an inverter station. Background technique [0002] In the field of high-voltage DC transmission technology, the pole control system controls the power transmission of DC, and the pole control system can also be considered as the core control system of DC. The signals that the control system needs to collect usually include voltage, current, trigger angle, arc extinguishing angle γ, etc. Variable, the value of the measured arc extinguishing angle γ is calculated in each cycle of the extreme control system, which is used to determine the moment of the current trigger pulse. By changing the moment of the trigger pulse, the power or DC voltage is changed to complete the control of the DC system. [0003] In HVDC power transmission projects, arc extingu...

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Problems solved by technology

[0005] The purpose of this application is to provide an optimal calculation method and device for the actual measured arc extinguishing angle of the inverter station, so as to solve the problems of frequent switching of the controller and commutation failure caused by the abnormality of the current zero-crossing signal when the actual AC system is normal

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